package com.shiro.redis;

import com.alibaba.fastjson.JSON;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import redis.clients.jedis.Jedis;
import redis.clients.jedis.JedisPool;
@Service
public class RedisService {

    @Autowired
    JedisPool jedisPool;

/***
 *
 * 获取单个对象
 * **/
    public <T> T get(KeyPrefix prefix,String key ,Class<T> clazz){
        Jedis jedis = null;
        try {
            jedis = jedisPool.getResource();
            String realKey = prefix.getPrefix()+key;
            String str =jedis.get(realKey);
            T t =stringTobean(str,clazz);
            return t;
        }finally {
            returnToPool(jedis);
        }
    }
    /***
     *
     * 设置对象
     * **/
    public <T> boolean set(KeyPrefix prefix,String key ,T value){
        Jedis jedis = null;
        try {
            jedis = jedisPool.getResource();
            String realKey = prefix.getPrefix()+key;
            int seconds = prefix.expireSeconds();
            String str = beanToString(value);
            if (str == null|| str.length()<0){
                return false;
            }
            if (seconds <=0) {
                jedis.set(realKey,str);
            }else{
                jedis.setex(realKey,seconds,str);
            }
            return true;
        }finally {
            returnToPool(jedis);
        }
    }
    /***
     *
     * 判断是否存在
     * **/
    public <T> boolean exists(KeyPrefix prefix,String key){
        Jedis jedis = null;
        try {
            jedis = jedisPool.getResource();
            String realKey = prefix.getPrefix()+key;
            return jedis.exists(realKey);
        }finally {
            returnToPool(jedis);
        }
    }
    /***
     *
     * 增加值
     * **/
    public <T> Long incr(KeyPrefix prefix,String key){
        Jedis jedis = null;
        try {
            jedis = jedisPool.getResource();
            String realKey = prefix.getPrefix()+key;
            return jedis.incr(realKey);
        }finally {
            returnToPool(jedis);
        }
    }

    /***
     *
     * 减少值
     * **/
    public <T> Long decr(KeyPrefix prefix,String key){
        Jedis jedis = null;
        try {
            jedis = jedisPool.getResource();
            String realKey = prefix.getPrefix()+key;
            return jedis.decr(realKey);
        }finally {
            returnToPool(jedis);
        }
    }
    private <T> String beanToString(T value) {
        if (value == null){
            return null;
        }
        Class<?> clazz = value.getClass();
        if (clazz == int.class||clazz == Integer.class){
            return ""+value;
        }else if(clazz == String.class){
            return (String) value;
        }else if (clazz == long.class|| clazz == Long.class){
            return ""+value;
        }else {
            return JSON.toJSONString(value);
        }

    }

    private <T> T stringTobean(String str,Class<T> clazz) {
        if(str == null || str.length()<0 ||clazz == null){
            return  null;
        }
        if (clazz == int.class||clazz == Integer.class){
            return (T) Integer.valueOf(str);
        }else if (clazz == long.class|| clazz == Long.class){
            return (T) Long.valueOf(str);
        }else if(clazz == String.class){
            return (T)str;
        }else {
            return JSON.toJavaObject(JSON.parseObject(str),clazz);
        }
    }

    private void returnToPool(Jedis jedis) {
        if (jedis != null) {
            jedis.close();
        }
    }




}
